Abstract
Changes in carbon and pigment content of four species of microalgae isolated from antarctic sea ice were followed over a period of 6 months, the first 3 in the light and the last 3 in complete darkness. With one exception, all organisms retained their viability throughout even though the medium was not supplemented with organic substances capable of serving as nutrients. In another series of experiments, growth responses to organic supplements were variable and pigment composition also was affected.

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